4. Phase Diagrams

Kinetics Of Transformations — Quiz

Test your understanding of kinetics of transformations with 5 practice questions.

Practice Questions

Question 1

Using the JMAK equation $X=1-\exp(-k t^n)$ with k=1×10^{-4}\,$\mathrm{s^{-2}}$ and n=2, what is the time t required for 50\\% transformation (X=0.5)?

Question 2

Using the JMAK equation $X=1-\exp(-k t^n)$ with k=5×10^{-4}\,$\mathrm{s^{-2}}$ and n=2, what is the time t required for 75\\% transformation (X=0.75)?

Question 3

In the JMAK model, an Avrami exponent n$\approx3$ typically indicates which nucleation and growth scenario?

Question 4

In a linearized JMAK plot of ln[-ln(1-X)] versus ln t, what do the slope and intercept represent?

Question 5

On a TTT diagram for steel, why do transformation times become longer at both high and low temperatures, forming a C-shaped curve?